src/ngircd/irc-login.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2010 Alexander Barton (alex@barton.de)
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * Login and logout
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <strings.h>
  25 #include <signal.h>
  26 #include <unistd.h>
  27
  28 #include "ngircd.h"
  29 #include "conn-func.h"
  30 #include "conf.h"
  31 #include "channel.h"
  32 #include "io.h"
  33 #include "log.h"
  34 #include "messages.h"
  35 #include "pam.h"
  36 #include "parse.h"
  37 #include "irc.h"
  38 #include "irc-info.h"
  39 #include "irc-write.h"
  40
  41 #include "exp.h"
  42 #include "irc-login.h"
  43
  44
  45 static bool Hello_User PARAMS(( CLIENT *Client ));
  46 static bool Hello_User_PostAuth PARAMS(( CLIENT *Client ));
  47 static void Kill_Nick PARAMS(( char *Nick, char *Reason ));
  48 static void Introduce_Client PARAMS((CLIENT *To, CLIENT *Client, int Type));
  49 static void Reject_Client PARAMS((CLIENT *Client));
  50
  51 static void cb_introduceClient PARAMS((CLIENT *Client, CLIENT *Prefix,
  52                                        void *i));
  53
  54 #ifdef PAM
  55 static void cb_Read_Auth_Result PARAMS((int r_fd, UNUSED short events));
  56 #endif
  57
  58 /**
  59  * Handler for the IRC "PASS" command.
  60  *
  61  * See RFC 2813 section 4.1.1, and RFC 2812 section 3.1.1.
  62  *
  63  * @param Client        The client from which this command has been received.
  64  * @param Req           Request structure with prefix and all parameters.
  65  * @returns             CONNECTED or DISCONNECTED.
  66  */
  67 GLOBAL bool
  68 IRC_PASS( CLIENT *Client, REQUEST *Req )
  69 {
  70         char *type, *orig_flags;
  71         int protohigh, protolow;
  72
  73         assert( Client != NULL );
  74         assert( Req != NULL );
  75
  76         /* Return an error if this is not a local client */
  77         if (Client_Conn(Client) <= NONE)
  78                 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  79                                           Client_ID(Client), Req->command);
  80
  81         if (Client_Type(Client) == CLIENT_UNKNOWN && Req->argc == 1) {
  82                 /* Not yet registered "unknown" connection, PASS with one
  83                  * argument: either a regular client, service, or server
  84                  * using the old RFC 1459 section 4.1.1 syntax. */
  85                 LogDebug("Connection %d: got PASS command (RFC 1459) ...",
  86                          Client_Conn(Client));
  87         } else if ((Client_Type(Client) == CLIENT_UNKNOWN ||
  88                     Client_Type(Client) == CLIENT_UNKNOWNSERVER) &&
  89                    (Req->argc == 3 || Req->argc == 4)) {
  90                 /* Not yet registered "unknown" connection or outgoing server
  91                  * link, PASS with three or four argument: server using the
  92                  * RFC 2813 section 4.1.1 syntax. */
  93                 LogDebug("Connection %d: got PASS command (RFC 2813, new server link) ...",
  94                          Client_Conn(Client));
  95         } else if (Client_Type(Client) == CLIENT_UNKNOWN ||
  96                    Client_Type(Client) == CLIENT_UNKNOWNSERVER) {
  97                 /* Unregistered connection, but wrong number of arguments: */
  98                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  99                                           Client_ID(Client), Req->command);
 100         } else {
 101                 /* Registered connection, PASS command is not allowed! */
 102                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 103                                           Client_ID(Client));
 104         }
 105
 106         Client_SetPassword(Client, Req->argv[0]);
 107
 108         /* Protocol version */
 109         if (Req->argc >= 2 && strlen(Req->argv[1]) >= 4) {
 110                 int c2, c4;
 111
 112                 c2 = Req->argv[1][2];
 113                 c4 = Req->argv[1][4];
 114
 115                 Req->argv[1][4] = '\0';
 116                 protolow = atoi(&Req->argv[1][2]);
 117                 Req->argv[1][2] = '\0';
 118                 protohigh = atoi(Req->argv[1]);
 119
 120                 Req->argv[1][2] = c2;
 121                 Req->argv[1][4] = c4;
 122
 123                 Client_SetType(Client, CLIENT_GOTPASS_2813);
 124         } else {
 125                 protohigh = protolow = 0;
 126                 Client_SetType(Client, CLIENT_GOTPASS);
 127         }
 128
 129         /* Protocol type, see doc/Protocol.txt */
 130         if (Req->argc >= 2 && strlen(Req->argv[1]) > 4)
 131                 type = &Req->argv[1][4];
 132         else
 133                 type = NULL;
 134
 135         /* Protocol flags/options */
 136         if (Req->argc >= 4)
 137                 orig_flags = Req->argv[3];
 138         else
 139                 orig_flags = "";
 140
 141         /* Implementation, version and IRC+ flags */
 142         if (Req->argc >= 3) {
 143                 char *impl, *ptr, *serverver, *flags;
 144
 145                 impl = Req->argv[2];
 146                 ptr = strchr(impl, '|');
 147                 if (ptr)
 148                         *ptr = '\0';
 149
 150                 if (type && strcmp(type, PROTOIRCPLUS) == 0) {
 151                         /* The peer seems to be a server which supports the
 152                          * IRC+ protocol (see doc/Protocol.txt). */
 153                         serverver = ptr ? ptr + 1 : "?";
 154                         flags = strchr(ptr ? serverver : impl, ':');
 155                         if (flags) {
 156                                 *flags = '\0';
 157                                 flags++;
 158                         } else
 159                                 flags = "";
 160                         Log(LOG_INFO,
 161                             "Peer on conenction %d announces itself as %s-%s using protocol %d.%d/IRC+ (flags: \"%s\").",
 162                             Client_Conn(Client), impl, serverver,
 163                             protohigh, protolow, flags);
 164                 } else {
 165                         /* The peer seems to be a server supporting the
 166                          * "original" IRC protocol (RFC 2813). */
 167                         if (strchr(orig_flags, 'Z'))
 168                                 flags = "Z";
 169                         else
 170                                 flags = "";
 171                         Log(LOG_INFO,
 172                             "Peer on connection %d announces itself as \"%s\" using protocol %d.%d (flags: \"%s\").",
 173                             Client_Conn(Client), impl,
 174                             protohigh, protolow, flags);
 175                 }
 176                 Client_SetFlags(Client, flags);
 177         }
 178
 179         return CONNECTED;
 180 } /* IRC_PASS */
 181
 182
 183 /**
 184  * Handler for the IRC "NICK" command.
 185  *
 186  * See RFC 2812, 3.1.2 "Nick message", and RFC 2813, 4.1.3 "Nick".
 187  *
 188  * This function implements the IRC command "NICK" which is used to register
 189  * with the server, to change already registered nicknames and to introduce
 190  * new users which are connected to other servers.
 191  *
 192  * @param Client        The client from which this command has been received.
 193  * @param Req           Request structure with prefix and all parameters.
 194  * @returns             CONNECTED or DISCONNECTED.
 195  */
 196 GLOBAL bool
 197 IRC_NICK( CLIENT *Client, REQUEST *Req )
 198 {
 199         CLIENT *intr_c, *target, *c;
 200         char *nick, *user, *hostname, *modes, *info;
 201         int token, hops;
 202
 203         assert( Client != NULL );
 204         assert( Req != NULL );
 205
 206         /* Some IRC clients, for example BitchX, send the NICK and USER
 207          * commands in the wrong order ... */
 208         if(Client_Type(Client) == CLIENT_UNKNOWN
 209             || Client_Type(Client) == CLIENT_GOTPASS
 210             || Client_Type(Client) == CLIENT_GOTNICK
 211 #ifndef STRICT_RFC
 212             || Client_Type(Client) == CLIENT_GOTUSER
 213 #endif
 214             || Client_Type(Client) == CLIENT_USER
 215             || Client_Type(Client) == CLIENT_SERVICE
 216             || (Client_Type(Client) == CLIENT_SERVER && Req->argc == 1))
 217         {
 218                 /* User registration or change of nickname */
 219
 220                 /* Wrong number of arguments? */
 221                 if( Req->argc != 1 )
 222                         return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
 223                                                    Client_ID( Client ),
 224                                                    Req->command );
 225
 226                 /* Search "target" client */
 227                 if( Client_Type( Client ) == CLIENT_SERVER )
 228                 {
 229                         target = Client_Search( Req->prefix );
 230                         if( ! target )
 231                                 return IRC_WriteStrClient( Client,
 232                                                            ERR_NOSUCHNICK_MSG,
 233                                                            Client_ID( Client ),
 234                                                            Req->argv[0] );
 235                 }
 236                 else
 237                 {
 238                         /* Is this a restricted client? */
 239                         if( Client_HasMode( Client, 'r' ))
 240                                 return IRC_WriteStrClient( Client,
 241                                                            ERR_RESTRICTED_MSG,
 242                                                            Client_ID( Client ));
 243
 244                         target = Client;
 245                 }
 246
 247 #ifndef STRICT_RFC
 248                 /* If the clients tries to change to its own nickname we won't
 249                  * do anything. This is how the original ircd behaves and some
 250                  * clients (for example Snak) expect it to be like this.
 251                  * But I doubt that this is "really the right thing" ... */
 252                 if( strcmp( Client_ID( target ), Req->argv[0] ) == 0 )
 253                         return CONNECTED;
 254 #endif
 255
 256                 /* Check that the new nickname is available. Special case:
 257                  * the client only changes from/to upper to lower case. */
 258                 if( strcasecmp( Client_ID( target ), Req->argv[0] ) != 0 )
 259                 {
 260                         if( ! Client_CheckNick( target, Req->argv[0] ))
 261                                 return CONNECTED;
 262                 }
 263
 264                 if (Client_Type(target) != CLIENT_USER &&
 265                     Client_Type(target) != CLIENT_SERVICE &&
 266                     Client_Type(target) != CLIENT_SERVER) {
 267                         /* New client */
 268                         LogDebug("Connection %d: got valid NICK command ...",
 269                              Client_Conn( Client ));
 270
 271                         /* Register new nickname of this client */
 272                         Client_SetID( target, Req->argv[0] );
 273
 274                         /* If we received a valid USER command already then
 275                          * register the new client! */
 276                         if( Client_Type( Client ) == CLIENT_GOTUSER )
 277                                 return Hello_User( Client );
 278                         else
 279                                 Client_SetType( Client, CLIENT_GOTNICK );
 280                 } else {
 281                         /* Nickname change */
 282                         if (Client_Conn(target) > NONE) {
 283                                 /* Local client */
 284                                 Log(LOG_INFO,
 285                                     "%s \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".",
 286                                     Client_TypeText(target), Client_Mask(target),
 287                                     Client_Conn(target), Client_ID(target),
 288                                     Req->argv[0]);
 289                                 Conn_UpdateIdle(Client_Conn(target));
 290                         } else {
 291                                 /* Remote client */
 292                                 LogDebug("%s \"%s\" changed nick: \"%s\" -> \"%s\".",
 293                                          Client_TypeText(target),
 294                                          Client_Mask(target), Client_ID(target),
 295                                          Req->argv[0]);
 296                         }
 297
 298                         /* Inform all users and servers (which have to know)
 299                          * of this nickname change */
 300                         if( Client_Type( Client ) == CLIENT_USER )
 301                                 IRC_WriteStrClientPrefix( Client, Client,
 302                                                           "NICK :%s",
 303                                                           Req->argv[0] );
 304                         IRC_WriteStrServersPrefix( Client, target,
 305                                                    "NICK :%s", Req->argv[0] );
 306                         IRC_WriteStrRelatedPrefix( target, target, false,
 307                                                    "NICK :%s", Req->argv[0] );
 308
 309                         /* Register old nickname for WHOWAS queries */
 310                         Client_RegisterWhowas( target );
 311
 312                         /* Save new nickname */
 313                         Client_SetID( target, Req->argv[0] );
 314
 315                         IRC_SetPenalty( target, 2 );
 316                 }
 317
 318                 return CONNECTED;
 319         } else if(Client_Type(Client) == CLIENT_SERVER ||
 320                   Client_Type(Client) == CLIENT_SERVICE) {
 321                 /* Server or service introduces new client */
 322
 323                 /* Bad number of parameters? */
 324                 if (Req->argc != 2 && Req->argc != 7)
 325                         return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 326                                                   Client_ID(Client), Req->command);
 327
 328                 if (Req->argc >= 7) {
 329                         /* RFC 2813 compatible syntax */
 330                         nick = Req->argv[0];
 331                         hops = atoi(Req->argv[1]);
 332                         user = Req->argv[2];
 333                         hostname = Req->argv[3];
 334                         token = atoi(Req->argv[4]);
 335                         modes = Req->argv[5] + 1;
 336                         info = Req->argv[6];
 337                 } else {
 338                         /* RFC 1459 compatible syntax */
 339                         nick = Req->argv[0];
 340                         hops = 1;
 341                         user = Req->argv[0];
 342                         hostname = Client_ID(Client);
 343                         token = atoi(Req->argv[1]);
 344                         modes = "";
 345                         info = Req->argv[0];
 346                 }
 347
 348                 c = Client_Search(nick);
 349                 if(c) {
 350                         /*
 351                          * the new nick is already present on this server:
 352                          * the new and the old one have to be disconnected now.
 353                          */
 354                         Log( LOG_ERR, "Server %s introduces already registered nick \"%s\"!", Client_ID( Client ), Req->argv[0] );
 355                         Kill_Nick( Req->argv[0], "Nick collision" );
 356                         return CONNECTED;
 357                 }
 358
 359                 /* Find the Server this client is connected to */
 360                 intr_c = Client_GetFromToken(Client, token);
 361                 if( ! intr_c )
 362                 {
 363                         Log( LOG_ERR, "Server %s introduces nick \"%s\" on unknown server!?", Client_ID( Client ), Req->argv[0] );
 364                         Kill_Nick( Req->argv[0], "Unknown server" );
 365                         return CONNECTED;
 366                 }
 367
 368                 c = Client_NewRemoteUser(intr_c, nick, hops, user, hostname,
 369                                          token, modes, info, true);
 370                 if( ! c )
 371                 {
 372                         /* out of memory, need to disconnect client to keep network state consistent */
 373                         Log( LOG_ALERT, "Can't create client structure! (on connection %d)", Client_Conn( Client ));
 374                         Kill_Nick( Req->argv[0], "Server error" );
 375                         return CONNECTED;
 376                 }
 377
 378                 /* RFC 2813: client is now fully registered, inform all the
 379                  * other servers about the new user.
 380                  * RFC 1459: announce the new client only after receiving the
 381                  * USER command, first we need more information! */
 382                 if (Req->argc < 7) {
 383                         LogDebug("Client \"%s\" is being registered (RFC 1459) ...",
 384                                  Client_Mask(c));
 385                         Client_SetType(c, CLIENT_GOTNICK);
 386                 } else
 387                         Introduce_Client(Client, c, CLIENT_USER);
 388
 389                 return CONNECTED;
 390         }
 391         else return IRC_WriteStrClient( Client, ERR_ALREADYREGISTRED_MSG, Client_ID( Client ));
 392 } /* IRC_NICK */
 393
 394
 395 /**
 396  * Handler for the IRC "USER" command.
 397  *
 398  * See RFC 2812, 3.1.3 "User message".
 399  *
 400  * @param Client        The client from which this command has been received.
 401  * @param Req           Request structure with prefix and all parameters.
 402  * @returns             CONNECTED or DISCONNECTED.
 403  */
 404 GLOBAL bool
 405 IRC_USER(CLIENT * Client, REQUEST * Req)
 406 {
 407         CLIENT *c;
 408 #ifdef IDENTAUTH
 409         char *ptr;
 410 #endif
 411
 412         assert(Client != NULL);
 413         assert(Req != NULL);
 414
 415         if (Client_Type(Client) == CLIENT_GOTNICK ||
 416 #ifndef STRICT_RFC
 417             Client_Type(Client) == CLIENT_UNKNOWN ||
 418 #endif
 419             Client_Type(Client) == CLIENT_GOTPASS)
 420         {
 421                 /* New connection */
 422                 if (Req->argc != 4)
 423                         return IRC_WriteStrClient(Client,
 424                                                   ERR_NEEDMOREPARAMS_MSG,
 425                                                   Client_ID(Client),
 426                                                   Req->command);
 427
 428                 /* User name */
 429 #ifdef IDENTAUTH
 430                 ptr = Client_User(Client);
 431                 if (!ptr || !*ptr || *ptr == '~')
 432                         Client_SetUser(Client, Req->argv[0], false);
 433 #else
 434                 Client_SetUser(Client, Req->argv[0], false);
 435 #endif
 436                 Client_SetOrigUser(Client, Req->argv[0]);
 437
 438                 /* "Real name" or user info text: Don't set it to the empty
 439                  * string, the original ircd can't deal with such "real names"
 440                  * (e. g. "USER user * * :") ... */
 441                 if (*Req->argv[3])
 442                         Client_SetInfo(Client, Req->argv[3]);
 443                 else
 444                         Client_SetInfo(Client, "-");
 445
 446                 LogDebug("Connection %d: got valid USER command ...",
 447                     Client_Conn(Client));
 448                 if (Client_Type(Client) == CLIENT_GOTNICK)
 449                         return Hello_User(Client);
 450                 else
 451                         Client_SetType(Client, CLIENT_GOTUSER);
 452                 return CONNECTED;
 453
 454         } else if (Client_Type(Client) == CLIENT_SERVER ||
 455                    Client_Type(Client) == CLIENT_SERVICE) {
 456                 /* Server/service updating an user */
 457                 if (Req->argc != 4)
 458                         return IRC_WriteStrClient(Client,
 459                                                   ERR_NEEDMOREPARAMS_MSG,
 460                                                   Client_ID(Client),
 461                                                   Req->command);
 462                 c = Client_Search(Req->prefix);
 463                 if (!c)
 464                         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 465                                                   Client_ID(Client),
 466                                                   Req->prefix);
 467
 468                 Client_SetUser(c, Req->argv[0], true);
 469                 Client_SetOrigUser(c, Req->argv[0]);
 470                 Client_SetHostname(c, Req->argv[1]);
 471                 Client_SetInfo(c, Req->argv[3]);
 472
 473                 LogDebug("Connection %d: got valid USER command for \"%s\".",
 474                          Client_Conn(Client), Client_Mask(c));
 475
 476                 /* RFC 1459 style user registration?
 477                  * Introduce client to network: */
 478                 if (Client_Type(c) == CLIENT_GOTNICK)
 479                         Introduce_Client(Client, c, CLIENT_USER);
 480
 481                 return CONNECTED;
 482         } else if (Client_Type(Client) == CLIENT_USER) {
 483                 /* Already registered connection */
 484                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 485                                           Client_ID(Client));
 486         } else {
 487                 /* Unexpected/invalid connection state? */
 488                 return IRC_WriteStrClient(Client, ERR_NOTREGISTERED_MSG,
 489                                           Client_ID(Client));
 490         }
 491 } /* IRC_USER */
 492
 493
 494 /**
 495  * Handler for the IRC "SERVICE" command.
 496  *
 497  * This function implements IRC Services registration using the SERVICE command
 498  * defined in RFC 2812 3.1.6 and RFC 2813 4.1.4.
 499  *
 500  * At the moment ngIRCd doesn't support directly linked services, so this
 501  * function returns ERR_ERRONEUSNICKNAME when the SERVICE command has not been
 502  * received from a peer server.
 503  *
 504  * @param Client        The client from which this command has been received.
 505  * @param Req           Request structure with prefix and all parameters.
 506  * @returns             CONNECTED or DISCONNECTED..
 507  */
 508 GLOBAL bool
 509 IRC_SERVICE(CLIENT *Client, REQUEST *Req)
 510 {
 511         CLIENT *c, *intr_c;
 512         char *nick, *user, *host, *info, *modes, *ptr;
 513         int token, hops;
 514
 515         assert(Client != NULL);
 516         assert(Req != NULL);
 517
 518         if (Client_Type(Client) != CLIENT_GOTPASS &&
 519             Client_Type(Client) != CLIENT_SERVER)
 520                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 521                                           Client_ID(Client));
 522
 523         if (Req->argc != 6)
 524                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 525                                           Client_ID(Client), Req->command);
 526
 527         if (Client_Type(Client) != CLIENT_SERVER)
 528                 return IRC_WriteStrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
 529                                   Client_ID(Client), Req->argv[0]);
 530
 531         /* Bad number of parameters? */
 532         if (Req->argc != 6)
 533                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 534                                           Client_ID(Client), Req->command);
 535
 536         nick = Req->argv[0];
 537         user = NULL; host = NULL;
 538         token = atoi(Req->argv[1]);
 539         hops = atoi(Req->argv[4]);
 540         info = Req->argv[5];
 541
 542         /* Validate service name ("nick name") */
 543         c = Client_Search(nick);
 544         if(c) {
 545                 /* Nick name collission: disconnect (KILL) both clients! */
 546                 Log(LOG_ERR, "Server %s introduces already registered service \"%s\"!",
 547                     Client_ID(Client), nick);
 548                 Kill_Nick(nick, "Nick collision");
 549                 return CONNECTED;
 550         }
 551
 552         /* Get the server to which the service is connected */
 553         intr_c = Client_GetFromToken(Client, token);
 554         if (! intr_c) {
 555                 Log(LOG_ERR, "Server %s introduces service \"%s\" on unknown server!?",
 556                     Client_ID(Client), nick);
 557                 Kill_Nick(nick, "Unknown server");
 558                 return CONNECTED;
 559         }
 560
 561         /* Get user and host name */
 562         ptr = strchr(nick, '@');
 563         if (ptr) {
 564                 *ptr = '\0';
 565                 host = ++ptr;
 566         }
 567         if (!host)
 568                 host = Client_Hostname(intr_c);
 569         ptr = strchr(nick, '!');
 570         if (ptr) {
 571                 *ptr = '\0';
 572                 user = ++ptr;
 573         }
 574         if (!user)
 575                 user = nick;
 576
 577         /* According to RFC 2812/2813 parameter 4 <type> "is currently reserved
 578          * for future usage"; but we use it to transfer the modes and check
 579          * that the first character is a '+' sign and ignore it otherwise. */
 580         modes = (Req->argv[3][0] == '+') ? ++Req->argv[3] : "";
 581
 582         c = Client_NewRemoteUser(intr_c, nick, hops, user, host,
 583                                  token, modes, info, true);
 584         if (! c) {
 585                 /* Couldn't create client structure, so KILL the service to
 586                  * keep network status consistent ... */
 587                 Log(LOG_ALERT, "Can't create client structure! (on connection %d)",
 588                     Client_Conn(Client));
 589                 Kill_Nick(nick, "Server error");
 590                 return CONNECTED;
 591         }
 592
 593         Introduce_Client(Client, c, CLIENT_SERVICE);
 594         return CONNECTED;
 595 } /* IRC_SERVICE */
 596
 597
 598 /**
 599  * Handler for the IRC "WEBIRC" command.
 600  *
 601  * See doc/Protocol.txt, section II.4:
 602  * "Update webchat/proxy client information".
 603  *
 604  * @param Client        The client from which this command has been received.
 605  * @param Req           Request structure with prefix and all parameters.
 606  * @returns             CONNECTED or DISCONNECTED.
 607  */
 608 GLOBAL bool
 609 IRC_WEBIRC(CLIENT *Client, REQUEST *Req)
 610 {
 611         /* Exactly 4 parameters are requited */
 612         if (Req->argc != 4)
 613                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 614                                           Client_ID(Client), Req->command);
 615
 616         if (!Conf_WebircPwd[0] || strcmp(Req->argv[0], Conf_WebircPwd) != 0)
 617                 return IRC_WriteStrClient(Client, ERR_PASSWDMISMATCH_MSG,
 618                                           Client_ID(Client));
 619
 620         LogDebug("Connection %d: got valid WEBIRC command: user=%s, host=%s, ip=%s",
 621                  Client_Conn(Client), Req->argv[1], Req->argv[2], Req->argv[3]);
 622
 623         Client_SetUser(Client, Req->argv[1], true);
 624         Client_SetOrigUser(Client, Req->argv[1]);
 625         Client_SetHostname(Client, Req->argv[2]);
 626         return CONNECTED;
 627 } /* IRC_WEBIRC */
 628
 629
 630 /**
 631  * Handler for the IRC "QUIT" command.
 632  *
 633  * See RFC 2812, 3.1.7 "Quit", and RFC 2813, 4.1.5 "Quit".
 634  *
 635  * @param Client        The client from which this command has been received.
 636  * @param Req           Request structure with prefix and all parameters.
 637  * @returns             CONNECTED or DISCONNECTED.
 638  */
 639 GLOBAL bool
 640 IRC_QUIT( CLIENT *Client, REQUEST *Req )
 641 {
 642         CLIENT *target;
 643         char quitmsg[LINE_LEN];
 644
 645         assert( Client != NULL );
 646         assert( Req != NULL );
 647
 648         /* Wrong number of arguments? */
 649         if( Req->argc > 1 )
 650                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 651
 652         if (Req->argc == 1)
 653                 strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
 654
 655         if ( Client_Type( Client ) == CLIENT_SERVER )
 656         {
 657                 /* Server */
 658                 target = Client_Search( Req->prefix );
 659                 if( ! target )
 660                 {
 661                         Log( LOG_WARNING, "Got QUIT from %s for unknown client!?", Client_ID( Client ));
 662                         return CONNECTED;
 663                 }
 664
 665                 Client_Destroy( target, "Got QUIT command.", Req->argc == 1 ? quitmsg : NULL, true);
 666
 667                 return CONNECTED;
 668         }
 669         else
 670         {
 671                 if (Req->argc == 1 && quitmsg[0] != '\"') {
 672                         /* " " to avoid confusion */
 673                         strlcpy(quitmsg, "\"", sizeof quitmsg);
 674                         strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
 675                         strlcat(quitmsg, "\"", sizeof quitmsg );
 676                 }
 677
 678                 /* User, Service, or not yet registered */
 679                 Conn_Close( Client_Conn( Client ), "Got QUIT command.", Req->argc == 1 ? quitmsg : NULL, true);
 680
 681                 return DISCONNECTED;
 682         }
 683 } /* IRC_QUIT */
 684
 685
 686 /**
 687  * Handler for the IRC "PING" command.
 688  *
 689  * See RFC 2812, 3.7.2 "Ping message".
 690  *
 691  * @param Client        The client from which this command has been received.
 692  * @param Req           Request structure with prefix and all parameters.
 693  * @returns             CONNECTED or DISCONNECTED.
 694  */
 695 GLOBAL bool
 696 IRC_PING(CLIENT *Client, REQUEST *Req)
 697 {
 698         CLIENT *target, *from;
 699
 700         assert(Client != NULL);
 701         assert(Req != NULL);
 702
 703         if (Req->argc < 1)
 704                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 705                                           Client_ID(Client));
 706 #ifdef STRICT_RFC
 707         /* Don't ignore additional arguments when in "strict" mode */
 708         if (Req->argc > 2)
 709                  return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 710                                            Client_ID(Client), Req->command);
 711 #endif
 712
 713         if (Req->argc > 1) {
 714                 /* A target has been specified ... */
 715                 target = Client_Search(Req->argv[1]);
 716
 717                 if (!target || Client_Type(target) != CLIENT_SERVER)
 718                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 719                                         Client_ID(Client), Req->argv[1]);
 720
 721                 if (target != Client_ThisServer()) {
 722                         /* Ok, we have to forward the PING */
 723                         if (Client_Type(Client) == CLIENT_SERVER)
 724                                 from = Client_Search(Req->prefix);
 725                         else
 726                                 from = Client;
 727                         if (!from)
 728                                 return IRC_WriteStrClient(Client,
 729                                                 ERR_NOSUCHSERVER_MSG,
 730                                                 Client_ID(Client), Req->prefix);
 731
 732                         return IRC_WriteStrClientPrefix(target, from,
 733                                         "PING %s :%s", Req->argv[0],
 734                                         Req->argv[1] );
 735                 }
 736         }
 737
 738         if (Client_Type(Client) == CLIENT_SERVER) {
 739                 if (Req->prefix)
 740                         from = Client_Search(Req->prefix);
 741                 else
 742                         from = Client;
 743         } else
 744                 from = Client_ThisServer();
 745         if (!from)
 746                 return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 747                                         Client_ID(Client), Req->prefix);
 748
 749         Log(LOG_DEBUG, "Connection %d: got PING, sending PONG ...",
 750             Client_Conn(Client));
 751
 752 #ifdef STRICT_RFC
 753         return IRC_WriteStrClient(Client, "PONG %s :%s",
 754                 Client_ID(from), Client_ID(Client));
 755 #else
 756         /* Some clients depend on the argument being returned in the PONG
 757          * reply (not mentioned in any RFC, though) */
 758         return IRC_WriteStrClient(Client, "PONG %s :%s",
 759                 Client_ID(from), Req->argv[0]);
 760 #endif
 761 } /* IRC_PING */
 762
 763
 764 /**
 765  * Handler for the IRC "PONG" command.
 766  *
 767  * See RFC 2812, 3.7.3 "Pong message".
 768  *
 769  * @param Client        The client from which this command has been received.
 770  * @param Req           Request structure with prefix and all parameters.
 771  * @returns             CONNECTED or DISCONNECTED.
 772  */
 773 GLOBAL bool
 774 IRC_PONG(CLIENT *Client, REQUEST *Req)
 775 {
 776         CLIENT *target, *from;
 777         char *s;
 778
 779         assert(Client != NULL);
 780         assert(Req != NULL);
 781
 782         /* Wrong number of arguments? */
 783         if (Req->argc < 1)
 784                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 785                                           Client_ID(Client));
 786         if (Req->argc > 2)
 787                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 788                                           Client_ID(Client), Req->command);
 789
 790         /* Forward? */
 791         if (Req->argc == 2 && Client_Type(Client) == CLIENT_SERVER) {
 792                 target = Client_Search(Req->argv[0]);
 793                 if (!target)
 794                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 795                                         Client_ID(Client), Req->argv[0]);
 796
 797                 from = Client_Search(Req->prefix);
 798
 799                 if (target != Client_ThisServer() && target != from) {
 800                         /* Ok, we have to forward the message. */
 801                         if (!from)
 802                                 return IRC_WriteStrClient(Client,
 803                                                 ERR_NOSUCHSERVER_MSG,
 804                                                 Client_ID(Client), Req->prefix);
 805
 806                         if (Client_Type(Client_NextHop(target)) != CLIENT_SERVER)
 807                                 s = Client_ID(from);
 808                         else
 809                                 s = Req->argv[0];
 810                         return IRC_WriteStrClientPrefix(target, from,
 811                                  "PONG %s :%s", s, Req->argv[1]);
 812                 }
 813         }
 814
 815         /* The connection timestamp has already been updated when the data has
 816          * been read from so socket, so we don't need to update it here. */
 817 #ifdef DEBUG
 818         if (Client_Conn(Client) > NONE)
 819                 Log(LOG_DEBUG,
 820                         "Connection %d: received PONG. Lag: %ld seconds.",
 821                         Client_Conn(Client),
 822                         time(NULL) - Conn_LastPing(Client_Conn(Client)));
 823         else
 824                  Log(LOG_DEBUG,
 825                         "Connection %d: received PONG.", Client_Conn(Client));
 826 #endif
 827         return CONNECTED;
 828 } /* IRC_PONG */
 829
 830
 831 /**
 832  * Initiate client registration.
 833  *
 834  * This function is called after the daemon received the required NICK and
 835  * USER commands of a new client. If the daemon is compiled with support for
 836  * PAM, the authentication sub-processs is forked; otherwise the global server
 837  * password is checked.
 838  *
 839  * @param Client        The client logging in.
 840  * @returns             CONNECTED or DISCONNECTED.
 841  */
 842 static bool
 843 Hello_User(CLIENT * Client)
 844 {
 845 #ifdef PAM
 846         int pipefd[2], result;
 847         CONN_ID conn;
 848         pid_t pid;
 849
 850         assert(Client != NULL);
 851         conn = Client_Conn(Client);
 852
 853         if (!Conf_PAM) {
 854                 /* Don't do any PAM authentication at all, instead emulate
 855                  * the beahiour of the daemon compiled without PAM support:
 856                  * because there can't be any "server password", all
 857                  * passwords supplied are classified as "wrong". */
 858                 if(Client_Password(Client)[0] == '\0')
 859                         return Hello_User_PostAuth(Client);
 860                 Reject_Client(Client);
 861                 return DISCONNECTED;
 862         }
 863
 864         /* Fork child process for PAM authentication; and make sure that the
 865          * process timeout is set higher than the login timeout! */
 866         pid = Proc_Fork(Conn_GetProcStat(conn), pipefd,
 867                         cb_Read_Auth_Result, Conf_PongTimeout + 1);
 868         if (pid > 0) {
 869                 LogDebug("Authenticator for connection %d created (PID %d).",
 870                          conn, pid);
 871                 return CONNECTED;
 872         } else {
 873                 /* Sub process */
 874                 Log_Init_Subprocess("Auth");
 875                 result = PAM_Authenticate(Client);
 876                 if (write(pipefd[1], &result, sizeof(result)) != sizeof(result))
 877                         Log_Subprocess(LOG_ERR,
 878                                        "Failed to pipe result to parent!");
 879                 Log_Exit_Subprocess("Auth");
 880                 exit(0);
 881         }
 882 #else
 883         assert(Client != NULL);
 884
 885         /* Check global server password ... */
 886         if (strcmp(Client_Password(Client), Conf_ServerPwd) != 0) {
 887                 /* Bad password! */
 888                 Reject_Client(Client);
 889                 return DISCONNECTED;
 890         }
 891         return Hello_User_PostAuth(Client);
 892 #endif
 893 }
 894
 895
 896 #ifdef PAM
 897
 898 /**
 899  * Read result of the authenticatior sub-process from pipe
 900  *
 901  * @param r_fd          File descriptor of the pipe.
 902  * @param events        (ignored IO specification)
 903  */
 904 static void
 905 cb_Read_Auth_Result(int r_fd, UNUSED short events)
 906 {
 907         CONN_ID conn;
 908         CLIENT *client;
 909         int result;
 910         size_t len;
 911         PROC_STAT *proc;
 912
 913         LogDebug("Auth: Got callback on fd %d, events %d", r_fd, events);
 914         conn = Conn_GetFromProc(r_fd);
 915         if (conn == NONE) {
 916                 /* Ops, none found? Probably the connection has already
 917                  * been closed!? We'll ignore that ... */
 918                 io_close(r_fd);
 919                 LogDebug("Auth: Got callback for unknown connection!?");
 920                 return;
 921         }
 922         proc = Conn_GetProcStat(conn);
 923         client = Conn_GetClient(conn);
 924
 925         /* Read result from pipe */
 926         len = Proc_Read(proc, &result, sizeof(result));
 927         if (len == 0)
 928                 return;
 929
 930         if (len != sizeof(result)) {
 931                 Log(LOG_CRIT, "Auth: Got malformed result!");
 932                 Reject_Client(client);
 933                 return;
 934         }
 935
 936         if (result == true) {
 937                 Client_SetUser(client, Client_OrigUser(client), true);
 938                 (void)Hello_User_PostAuth(client);
 939         } else
 940                 Reject_Client(client);
 941 }
 942
 943 #endif
 944
 945
 946 /**
 947  * Reject a client because of wrong password.
 948  *
 949  * This function is called either when the global server password or a password
 950  * checked using PAM has been wrong.
 951  *
 952  * @param Client        The client to reject.
 953  */
 954 static void
 955 Reject_Client(CLIENT *Client)
 956 {
 957         Log(LOG_ERR,
 958             "User \"%s\" rejected (connection %d): Access denied!",
 959             Client_Mask(Client), Client_Conn(Client));
 960         Conn_Close(Client_Conn(Client), NULL,
 961                    "Access denied! Bad password?", true);
 962 }
 963
 964
 965 /**
 966  * Finish client registration.
 967  *
 968  * Introduce the new client to the network and send all "hello messages"
 969  * to it after authentication has been succeeded.
 970  *
 971  * @param Client        The client logging in.
 972  * @returns             CONNECTED or DISCONNECTED.
 973  */
 974 static bool
 975 Hello_User_PostAuth(CLIENT *Client)
 976 {
 977         Introduce_Client(NULL, Client, CLIENT_USER);
 978
 979         if (!IRC_WriteStrClient
 980             (Client, RPL_WELCOME_MSG, Client_ID(Client), Client_Mask(Client)))
 981                 return false;
 982         if (!IRC_WriteStrClient
 983             (Client, RPL_YOURHOST_MSG, Client_ID(Client),
 984              Client_ID(Client_ThisServer()), PACKAGE_VERSION, TARGET_CPU,
 985              TARGET_VENDOR, TARGET_OS))
 986                 return false;
 987         if (!IRC_WriteStrClient
 988             (Client, RPL_CREATED_MSG, Client_ID(Client), NGIRCd_StartStr))
 989                 return false;
 990         if (!IRC_WriteStrClient
 991             (Client, RPL_MYINFO_MSG, Client_ID(Client),
 992              Client_ID(Client_ThisServer()), PACKAGE_VERSION, USERMODES,
 993              CHANMODES))
 994                 return false;
 995
 996         /* Features supported by this server (005 numeric, ISUPPORT),
 997          * see <http://www.irc.org/tech_docs/005.html> for details. */
 998         if (!IRC_Send_ISUPPORT(Client))
 999                 return DISCONNECTED;
1000
1001         if (!IRC_Send_LUSERS(Client))
1002                 return DISCONNECTED;
1003         if (!IRC_Show_MOTD(Client))
1004                 return DISCONNECTED;
1005
1006         /* Suspend the client for a second ... */
1007         IRC_SetPenalty(Client, 1);
1008
1009         return CONNECTED;
1010 }
1011
1012
1013 /**
1014  * Kill all users with a specific nick name in the network.
1015  *
1016  * @param Nick          Nick name.
1017  * @param Reason        Reason for the KILL.
1018  */
1019 static void
1020 Kill_Nick( char *Nick, char *Reason )
1021 {
1022         REQUEST r;
1023
1024         assert( Nick != NULL );
1025         assert( Reason != NULL );
1026
1027         r.prefix = (char *)Client_ThisServer( );
1028         r.argv[0] = Nick;
1029         r.argv[1] = Reason;
1030         r.argc = 2;
1031
1032         Log( LOG_ERR, "User(s) with nick \"%s\" will be disconnected: %s", Nick, Reason );
1033         IRC_KILL( Client_ThisServer( ), &r );
1034 } /* Kill_Nick */
1035
1036
1037 /**
1038  * Introduce a new user or service client in the network.
1039  *
1040  * @param From          Remote server introducing the client or NULL (local).
1041  * @param Client        New client.
1042  * @param Type          Type of the client (CLIENT_USER or CLIENT_SERVICE).
1043  */
1044 static void
1045 Introduce_Client(CLIENT *From, CLIENT *Client, int Type)
1046 {
1047         /* Set client type (user or service) */
1048         Client_SetType(Client, Type);
1049
1050         if (From) {
1051                 if (Conf_IsService(Conf_GetServer(Client_Conn(From)),
1052                                    Client_ID(Client)))
1053                         Client_SetType(Client, CLIENT_SERVICE);
1054                 LogDebug("%s \"%s\" (+%s) registered (via %s, on %s, %d hop%s).",
1055                          Client_TypeText(Client), Client_Mask(Client),
1056                          Client_Modes(Client), Client_ID(From),
1057                          Client_ID(Client_Introducer(Client)),
1058                          Client_Hops(Client), Client_Hops(Client) > 1 ? "s": "");
1059         } else {
1060                 Log(LOG_NOTICE, "%s \"%s\" registered (connection %d).",
1061                     Client_TypeText(Client), Client_Mask(Client),
1062                     Client_Conn(Client));
1063                 Log_ServerNotice('c', "Client connecting: %s (%s@%s) [%s] - %s",
1064                                  Client_ID(Client), Client_User(Client),
1065                                  Client_Hostname(Client),
1066                                  Conn_IPA(Client_Conn(Client)),
1067                                  Client_TypeText(Client));
1068         }
1069
1070         /* Inform other servers */
1071         IRC_WriteStrServersPrefixFlag_CB(From,
1072                                 From != NULL ? From : Client_ThisServer(),
1073                                 '\0', cb_introduceClient, (void *)Client);
1074 } /* Introduce_Client */
1075
1076
1077 /**
1078  * Introduce a new user or service client to a remote server.
1079  *
1080  * This function differentiates between RFC1459 and RFC2813 server links and
1081  * generates the appropriate commands to register the new user or service.
1082  *
1083  * @param To            The remote server to inform.
1084  * @param Prefix        Prefix for the generated commands.
1085  * @param data          CLIENT structure of the new client.
1086  */
1087 static void
1088 cb_introduceClient(CLIENT *To, CLIENT *Prefix, void *data)
1089 {
1090         CLIENT *c = (CLIENT *)data;
1091         CONN_ID conn;
1092         char *modes, *user, *host;
1093
1094         modes = Client_Modes(c);
1095         user = Client_User(c) ? Client_User(c) : "-";
1096         host = Client_Hostname(c) ? Client_Hostname(c) : "-";
1097
1098         conn = Client_Conn(To);
1099         if (Conn_Options(conn) & CONN_RFC1459) {
1100                 /* RFC 1459 mode: separate NICK and USER commands */
1101                 Conn_WriteStr(conn, "NICK %s :%d", Client_ID(c),
1102                               Client_Hops(c) + 1);
1103                 Conn_WriteStr(conn, ":%s USER %s %s %s :%s",
1104                               Client_ID(c), user, host,
1105                               Client_ID(Client_Introducer(c)), Client_Info(c));
1106                 if (modes[0])
1107                         Conn_WriteStr(conn, ":%s MODE %s +%s",
1108                                       Client_ID(c), Client_ID(c), modes);
1109         } else {
1110                 /* RFC 2813 mode: one combined NICK or SERVICE command */
1111                 if (Client_Type(c) == CLIENT_SERVICE
1112                     && strchr(Client_Flags(To), 'S'))
1113                         IRC_WriteStrClientPrefix(To, Prefix,
1114                                          "SERVICE %s %d * +%s %d :%s",
1115                                          Client_Mask(c),
1116                                          Client_MyToken(Client_Introducer(c)),
1117                                          Client_Modes(c), Client_Hops(c) + 1,
1118                                          Client_Info(c));
1119                 else
1120                         IRC_WriteStrClientPrefix(To, Prefix,
1121                                          "NICK %s %d %s %s %d +%s :%s",
1122                                          Client_ID(c), Client_Hops(c) + 1,
1123                                          user, host,
1124                                          Client_MyToken(Client_Introducer(c)),
1125                                          modes, Client_Info(c));
1126         }
1127 } /* cb_introduceClient */
1128
1129
1130 /* -eof- */